Gold Knoll Collection System Upgrade at Royal Mountain King Mine

Summary

SCH Number
2008098262
Lead Agency
Fish & Game #2
Document Title
Gold Knoll Collection System Upgrade at Royal Mountain King Mine
Document Type
NOE - Notice of Exemption
Received
Posted
9/23/2008

Document Description
The Gold Knoll-Royal Mountain King Project is part of the Regional Water Quality Control Board Order 5-01-040 and Waste Water Discharge Requirements R5-2008-0021 to control discharges from the Royal Mountain King Mine Site in Calaveras County. The project proposes to upgrade the Gold Knoll collection System by replacing the existing open pond system with buried sump, collection trench, and blanket drain to provide for collection of captured flows to the maximum extent possible. The captured flow from the Gold Knoll Overburden Disposal System (ODS) will be pumped to Skyrocket Pit Lake where the stored water will be released to Littlejohn's Creek under NPDES Permit CA0085243. The proposed design incorporates a linear collection trench that follows a contour along the northeast, north, and northwest sides of upper pond. On the east side of the upper pond a 20 foot wide blanket drain will be extended upland of the collection trench to collect seeps that emerge above the pond level. A 12 foot deep collection sump will be constructed at the uppermost corner of the existing pond. All excavated areas will be lined with geo-textile material, backfield with gravel, capped with 2 feet of soil/clay cover, and revegetated. The area surrounding the sump will be backfilled with 5 feet of soil to allow the surface water runoff to pass over the top of the sump without ponding or infiltrating. The fill will extend approximately 20 feet to the south of the sump and its surface will drain to the east. A 400 gpm capacity submersible sump pump and float activated level switches will be installed in the sump and connected to aboveground pipe conveying captured flows to Skyrocket Pit Lake.

Contact Information
Amy Kennedy
California Department of Fish and Game
North Central Region 1701 Nimbus Road, Suite A
Sacramento, CA 95670

Phone : (916) 358-2842

Location

Counties
Calaveras
Other Location Info
4461 Rock Creek Road, Copperopolis, CA. Unnamed Tributary to Littlejohn's Creek, Township 2N, Range 12E, Section 32 of the Copperopolis USGS Quadrangle.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15330
Reasons for Exemption
Project is part of the RWQCB Executive Order 5-01-040 to control discharges to downstream areas (thus minimizing hazardous substances from entering the water system).

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.

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